Apparatus for stamping and shaping dental metal crowns.



No. 828,109. PATBNTED AUG, v, 1.906.

' A. GRUNSTEIN. APPARATUS FOR STAMPING AND SHAPING DENTAL METAL BROWNS. APPLICATION FILED JUNB2,1904.

2 SHEETS SHEI-IT 1.

G I my A I i O ms mamas PETERS co., wasnmarou, n c.

-"No..828,109... PATENTED AUG. 7. 1906';

A GRUNSTEIN. APPARATUS FOR STAMPING AND SHAPING DENTAL METAL 'onowns.

APPLIUATION FILED JUNE 2, 1904.

2 SHEETS-SHEET Z orifices 9 of different sizes.

UNITED STATES PATENT OFFICE.

APPARATUS FOR STAMPING AND SHAPING DENTAL METAL CROWNS.

Specification of Letters Patent.

LPatented Aug. '7, 1906.

Application filed June 2, 1904. erial. No. 210-828.

To all whom it may concern.-

Be it known that I,'ADOLF GRtiNsTEIN, a subject of the King of Austria-Hungary, residing at Budapest, Austria-Hungary, have invented a new and Improved Apparatus for Stamping and Shaping Dental Metal Crowns, of which the following is a full, clear, and exact description.

The present invention consists of an apparatus for stamping'and shaping the metal crowns used in connection with dentistry, and comprises the details of construction hereinafter set forth, and particularly pointed out in the claims.

This invention has relation to apparatus for stamping and shaping dental metal crowns, and has for its object the provision of novel apparatus whereby metal blanks may be stamped from a sheet and then by a series of steps shaped to the required size and form.

The invention consists of the novel construction, combination, and arrangement of parts hereinafter described and specifically claimed.

I have illustrated my improvements in the accompanying drawings, in which like numerals designate corresponding parts throughout the several views, in which Figure 1 is a vertical central sectional view of the apparatus constructed-according to my invention. Fig. 2 is a front elevation of the same. Fig. 3 is a top plan view of the same. Fig. 4 is a sectional view taken on the line 4 4 of Fig. 2. Fig. 5 is a top plan View, on an enlarged scale, of the matrix-holding plate and part of the base-plate. Fig. 6 is a side elevation of the stamping tool or plate, and Fig. 7 is a fragmentary detail vertical sectional view showing part of one of the dies and the matrix belonging to such die.

The base-plate 1 of the apparatus has a vertical screw-spindle '2, rotatably mounted thereon at the center of the baseplate, and in a recess in said base-plate a revoluble matrix-plate 6 is mounted, which matrix-plate is adapted to be revolved around the spindle 2 as a center, but is not influenced by the threads of the spindle. The matrix-plate 6 is provided with a plurality of suitablematrix- In each of these matrix-orifices is mounted a mold or 'core 13,

an elastic plate 14 of rubber or the like being placed under each such mold or core.

The base-plate 1 is provided with an orifice 15, extending from near the spindle 2 to the front edge of the base-plate, so that if necessary the molds or cores 13 may be pushed out of the orifices 9 from beneath the baseplate.

The spindle 2 is formed with a head 2, in

which is mounted a lever 2", by means of which the spindle may be turned. A stamping-plate 7 surroundsthe spindle 2 just below the head 2, and this plate is formed with a series of female dies 10 which are disposed near the edge of the plate and are of varying size and are adapted to receive corresponding male dies 5. The male dies 5 are mounted in an intermediate plate 3, which is mounted on the screw-spindle 2 and is provided with an internal thread to engage the thread of the screw-spindle, so that when the screw-spindle is rotated the said intermediate plate will be moved up and down.

A number of hollow standards 8 are interposed between the stamping-plate 7 and the matrix-plate 6, and these standards receive bolts 8 which pass through the matrix-plate and the standards and extend through the stamping-plate 7 and carry nuts 8 on their upper ends.

The standards 8 pass through holes in the intermediate plate 3, these holes being sufficiently large to permit the intermediate plate to be moved up and down without frictional engagement with the standards, and the hollow standards 8 and the bolts 8 serve to sustain the stamping-plate 7 in fixed position relatively to the matrix-plate 6.

The intermediate plate 3 is preferably formed in the manner clearly shown in Fig. 1

of the drawingsthat is, it is composed of two plates laid one on top of the other and secured together by a nut 3 at the center, which nut is secured in position and attached to both plates in any suitable maiiner such, for instance, as by making the holes at the centers of the plates in which the nut seats a tight fit or by shrinking the plates upon the nut or in any other well-known or desired manner.

The purpose of forming the intermediate plate in two sections, as above described, is

to facilitate the boring and tapping of the holes in the upper plate, which receive the male dies 5, and the boring of the holes in the lower plate, whichreceive certain dies and die-holders hereinafter described.

The intermediate plate carries a series of downwardly-extending dies 4, each of which is adapted to engage with one of the matrices of the matrix-plate 6. In addition to the dies 4 the intermediate plate 3 carries a dieholder 16, which is adapted to receive successively a'series of dies, each of which is formed with a countersunk lower end of such configuration on its lower end so as to form the tops of the different crowns in a variety of shapes. One of these dies 16 is shown in position in the holder 16 in Fig. 1 of the drawings, and it is held in position in the holder by a thumb-screw 16.

The dies 4 are each formed with a recess or die-cavity 4 on its lower end, so that each die will when brought down by the move ment of the intermediate plate 3, so as to enter its appropriate orifice 9 in the plate 6, fit over the matrix 13 in that orifice, the recess 4 in the die 4 being somewhat larger than the matrix over which it fits, so as to permit of the metal disk which is to form the crown being pressed down over the matrix.

In Fig. 7 of the drawings aIpartially-formed crown 13 is shown in position over the ma triX 13 and within the recess 4 of the die 4. The plate 6 is provided with a plurality of half-round recesses 11 in its periphery, and the base-plate'is provided with a single recess 12 at one part of its circumference, which recess 12 successively registers with the recesses 11 as the plate 6 is revolved, the recess 12 and one of the recesses 11 serving to receive the pin 12, which serves to lock the plate 6 in any one of the several positions necessary to bring the orifices 13 successively under the tool-holder 16 or under their appropriate dies 4.

The screw-spindle 2 is sustained against longitudinal movement by a shoulder 17 on the screw-spindle and by anut 17, that is fixed on the screw-spindle under the baseplate 1, this construction of parts permitting the screw-spindle to revolve freely and at the same time preventing any longitudinal movement of the same.

The parts being constructed and arranged as above described and as shown in the drawings, the apparatus is operated in the following manner: The pin 12 being removed, the plates 6 and 7 are adjusted with the required matrix-orifice 9 and die 4 in front of the operator, and the plate 6 is then looked to the base-plate by replacing the'pin 12 in the recess l2 and the registering recess .11. The metal plate from which the blanks are to be struck is then inserted between the die and the matrix-orifice, which are at the front of the appartaus, and by turning the screwspindle 2 the die is lowered, whereby the metal plate is cut out and roughly formed over the matrix 13 in the matrix-opening. The screw-spindle is then turned in the reverse direction, so as to elevate the inter mediate plate 3 and the dies 4, and the appropriate die having been selected and fitted in the die-holder 16 the plate 3 is again lowered by turning the screw-spindle, and the top of the roughly-formed crown is given the desired contour by the action of the selected die 16. The intermediate plate 3 is again raised by turning the screw in the proper direction, and the roughly-formed crown is removed from the matrix 13 and is placed on top of one of the male dies 5, and the plate 3 is then raised by turning the screw-spindle, and the crown is forced through the female die 10, and thereby formed to final shape.

Having described my invention, I claim 1. A device for forming and shaping dentistry-crowns, consisting of a base-plate, a matrix-plate mounted on said base-plate and having matrices arranged therein near its periphery and an upper stationary plate having orifices of different diameters around its periphery, a central vertical spindle having a screw-thread thereon and an intermediate plate having an internal thread to engage said spindle and having a series of stamps on its upper surface to engage the orifices of the upper plate and a series of dies on its lower surface to engage the matrices of the lower plate substantially as described.

2. A device for forming and shaping dental crowns, consisting of a base-plate, a matrix plate rotatably mounted on said base-plate, said matrix-plate having a series of matrixopenings arranged around its center, a vertical screw-spindle mounted to rotate in said base-plate, an upper plate connected to said matrix-plate by vertical standards and having a series of orifices therein, means for looking the matrix-plate to the base-plate at a plurality of positions, an intermediate plate mounted on said vertical standards and having a series of upwardly-extending stamps corresponding to the orifices in the upper plate, and a series of depending dies corresponding to the matrices in the matrix-plate, said intermediate plate having an internal thread to engage the said spindle, substantially as described.

3. A device for forming and shaping dental crowns consisting of a base-plate, a rotary matriX- plate mounted thereon, a screwthreaded spindle rotatably mounted at the center of said base-plate, an upper stationary plate, a series of vertical standards connecting said upper plate to said matrix-plate, a series of dies arranged in the matrices of the matrix-plate, an intermediate plate having an internal thread to engage said spindle and I, having a series of stamps on its upper surface, In Witness whereof I have hereunto set my I 5 said upper plate being provided With a series hand in presence of two Witnesses. of orifices to receive said stamps, a series of ADOLF GRUNSTEIN. depending dies carried by said intermediate Witnesses: plate to engage the said matrices, a die- RAsZToR MAROELL, r0 holder 7 depending from said' intermediate l LOUIS VANDORN.

plate and adapted to receive dies and means for locking said matrix-plate against rotation on said base-plate, substantially as described. 

